package com.pams.inerceptor;


import cn.hutool.jwt.JWT;
import cn.hutool.jwt.JWTUtil;
import com.pams.context.BaseContext;
import com.pams.handler.BaseException;
import com.pams.properties.JwtProperties;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader("token");

        //2、校验令牌
        try {

            JWT jwt = JWT.of(token);

           if(!JWTUtil.verify(token, jwtProperties.getUserSecretKey().getBytes())){

               throw new BaseException("令牌验证失败");
            }

            String ttl = jwt.getPayload("ttl").toString();
            long ttlTime = Long.parseLong(ttl);
            if(!(ttlTime - System.currentTimeMillis()>0)){
                throw new BaseException("令牌已过期,请重新登录");
            }

         String username = jwt.getPayload("username").toString();   BaseContext.setCurrentUsername(jwt.getPayload("username").toString());

            System.out.println(username+"-----------");

            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
